:root{--bg: #ffffff;--fg: #1f2328;--fg-muted: #6b7280;--panel: #ffffff;--panel-border: #e5e1d8;--accent: #4a6cf7;--reader-bg: #f7f5f0;--reader-fg: #1f2328;--shadow: 0 4px 24px rgba(0, 0, 0, .08)}[data-theme=dark]{--bg: #1b1d21;--fg: #e5e7eb;--fg-muted: #9ca3af;--panel: #24272c;--panel-border: #33373d;--accent: #7c9bff;--reader-bg: #1b1d21;--reader-fg: #c9cdd3;--shadow: 0 4px 24px rgba(0, 0, 0, .4)}[data-theme=sepia]{--bg: #f3e9d2;--fg: #433422;--fg-muted: #8a7a5c;--panel: #fbf3e0;--panel-border: #e3d5b8;--accent: #a36f2e;--reader-bg: #f3e9d2;--reader-fg: #433422}*{box-sizing:border-box;margin:0;padding:0}[hidden]{display:none!important}html,body{height:100%}body{font-family:system-ui,-apple-system,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;background:var(--bg);color:var(--fg);transition:background .2s,color .2s}.open-screen{height:100vh;display:flex;align-items:stretch}.bookshelf-panel{width:420px;max-width:52vw;flex:none;display:flex;flex-direction:column;background:var(--panel);border-right:1px solid var(--panel-border);padding:18px 14px;overflow:hidden}.bookshelf-panel .bookshelf{margin-top:0;border-top:none;padding-top:0;flex:1;min-height:0;display:flex;flex-direction:column}.bookshelf-panel .bookshelf-grid{flex:1;min-height:0;max-height:none;display:grid;grid-template-columns:repeat(auto-fill,minmax(112px,1fr));gap:12px;overflow-y:auto;align-content:start;padding:2px}.shelf-resizer{flex:none;width:7px;cursor:col-resize;background:transparent;transition:background .15s;position:relative;z-index:5}.shelf-resizer:hover,.shelf-resizer.dragging{background:var(--accent);opacity:.7}.open-main{flex:1;min-width:0;display:flex;align-items:center;justify-content:center;padding:24px}.open-card{text-align:center;padding:48px 56px;background:var(--panel);border:1px solid var(--panel-border);border-radius:16px;box-shadow:var(--shadow);max-width:480px}.open-logo{font-size:56px;margin-bottom:12px}.open-card h1{font-size:24px;margin-bottom:8px}.open-sub{color:var(--fg-muted);font-size:14px;margin-bottom:28px}.btn-primary{background:var(--accent);color:#fff;border:none;border-radius:8px;padding:12px 32px;font-size:16px;cursor:pointer;transition:filter .15s}.btn-primary:hover{filter:brightness(1.1)}.open-hint{margin-top:16px;color:var(--fg-muted);font-size:13px}.open-formats{margin-top:24px;color:var(--fg-muted);font-size:12px}.error-box{margin-top:16px;padding:10px 14px;border-radius:8px;font-size:13px;line-height:1.5;text-align:left;color:#b3261e;background:#fdecea;border:1px solid #f5c6c0;white-space:pre-wrap;word-break:break-all}.open-card.dragover{outline:2px dashed var(--accent);outline-offset:4px}.reader-screen{display:flex;flex-direction:column;height:100vh;position:relative}.top-bar{display:flex;align-items:center;gap:8px;padding:8px 16px;background:var(--panel);border-bottom:1px solid var(--panel-border);z-index:10;flex:none}.top-title{flex:1;min-width:0;display:flex;flex-direction:column;line-height:1.3}#book-title{font-size:15px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.book-author{font-size:12px;color:var(--fg-muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.top-right{display:flex;gap:4px}.icon-btn{background:transparent;border:1px solid transparent;border-radius:6px;color:var(--fg);font-size:15px;padding:6px 10px;cursor:pointer;transition:background .15s}.icon-btn:hover{background:var(--bg)}.view-container{flex:1;min-height:0;position:relative}.view-container foliate-view{position:absolute;top:0;right:0;bottom:0;left:0;background:var(--reader-bg);color:var(--reader-fg)}.view-container::part(content){background:var(--reader-bg)}.bottom-bar{display:flex;align-items:center;gap:12px;padding:8px 16px;background:var(--panel);border-top:1px solid 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.15s}.history-item:hover{background:var(--panel-border)}.history-item-info{flex:1;min-width:0}.history-item-title{font-size:14px;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.history-item-meta{font-size:12px;color:var(--fg-muted)}.history-item-delete{background:transparent;border:none;color:var(--fg-muted);font-size:14px;cursor:pointer;padding:4px 6px;border-radius:4px}.history-item-delete:hover{color:#c0392b}.click-zone{position:absolute;top:0;bottom:0;width:30%;z-index:5;cursor:pointer}.click-left{left:0}.click-right{right:0}.note-popup{position:absolute;z-index:45;display:flex;gap:4px;background:var(--panel);border:1px solid var(--panel-border);border-radius:8px;box-shadow:var(--shadow);padding:4px}.note-btn{border:none;background:transparent;color:var(--fg);font-size:13px;padding:6px 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